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just for reference, this is what my dyno looks like with the electrics working, NA vs SC

61609


granted dynos vary, but that should be an offset. Ours are very different shapes. With the IMA and SC the torque is very flat, varies less than 20 lb-ft from 1500 to redline. Yours looks like you are missing 100 lb-ft down at the bottom (where the IMA should be adding that much) but ends up in about the same place up top.

I'm guessing the shop did that to eliminate the IMA variance from the testing. Just sayin' your car is probably already a lot stronger than you think 😃

There is no radical difference between the stock manifold and the GE8. My shop measured runner length and diameter when they did my cam swap and couldn't find any difference. Does look better imo, but probably not your restriction.
 
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Discussion Starter · #42 ·
So I visited the shop yesterday to drop off the clutch & collect my old Rota wheels & brakes.

A few pics of the car with the Spoon bits installed & the Mugen GP wheels. Oooosh, lovely.

Rear calipers have been painted black as the original finish was looking rough.

Custom mid-pipe & primary de-cat are in now. We are just awaiting the HKS Forged rods + pistons & headgasket and then the engine build can begin!













 

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Discussion Starter · #44 ·
Doing a little more reading it’s looking like the HKS GTS4015HP blower may not be the best fit. As it is designed for response vs big power.

According to HKS the max recommended impeller speed is 110k rpm.

The standard pulley is 100mm which produces a 98k rpm and 0.7 bar boost.

The smallest pulley size you can use is 90mm which produces 109k rpm and 0.98 bar boost.

The HKS GTS4015HP can flow 100-150bhp according to HKS. 100bhp no doubt being with the 100mm pulley and no air restrictors present.

My guess would be a 125bhp max flow with the 90mm pulley and 0.98 bar of boost.

This should make 250bhp flywheel achievable. Maybe more if other gains are made elsewhere in the drive train.

Im intrigued tbh.
 

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Discussion Starter · #45 ·
OK so a mild update here, it's been a while since I've updated the thread. The forged engine is finally built up and in the car! It's being run in now and then it just needs mapping which should take place next week hopefully.

A few more pictures and details of the samller modifications that have been made.

  • Kansai Service Carbon Radiator shroud & cold air feed is now in.
  • Mugen Grill LEDs
  • Mugen Gearknob
  • Spoon rear view mirror
  • Honda OEM armrest
  • Honda OEM illuminated carbon door sills
  • Painted EGR Valve
  • GE8 Manifold

The car is going to have H&R wheel spacers front & rear added too. These are essential on the front as there isn;t much clearance for the Spoon brakes on the wheels & the rear is just to bring them in-line with the front of the car and look less "tucked" into the arches.























A cheeky cold start video. Now the iPhone doesn;t do the best job at picking up the sound but it is loud. Sound raspier in the video than it is IRL. May look into a different back box other than the Spoon N1, but thats something to look at post mapping. Enjoy!


CRZ by nathan proudfoot, on Flickr
 

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Very Nice! Looking forward to your verdict on this once its tuned.
Did you also get the Spoon Front Sway Bar fitted yet?
 

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Discussion Starter · #47 · (Edited)
Very Nice! Looking forward to your verdict on this once its tuned.
Did you also get the Spoon Front Sway Bar fitted yet?

Yes mate, Spoon front anti-roll bar is on! Not driven it anywhere so can't comment yet.

You & me both! I'm very excited for it all. Low key pessimistic for the power though, don't want to get to hyped up. Worst case scenario is that we switch the SC unit out for a bigger blower!
 

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Discussion Starter · #49 · (Edited)
I've driven around 50 miles give or take so far with the car. Sadly the weather is around 10C & wet so not the best for testing the limits of the car.

First things first, power. The car did not make anywhere near the 250BHP I was hoping for. A shade under 200BHP flywheel with IMA assist. This is confusing given how HKS rate the 4015HP blower between 100-150BHP. According to the tuner we were maxing the 330cc HKS injectors & any further we would of been hitting knock issues. Now we could go to a smaller pulley but again injectors would limit us along with even hotter IATs. Currently the car runs very well so I'd rather not throw another potential issue at it.

How does this power feel? Petty damn epic, the car feels like it has a big V6 upfront with the power curve, it just keeps pulling! The sound with the double de-cat & N1 backbox is pretty extreme. Something I may need to tone down once the excitement wears off!

The handling mods are what have really changed this car, the Spoon suspension is compliant yet stiff enough to hold the car level around bends. The same can be said for the Spoon brakes, nice & progressive but stop hard when you want. You can tell Spoon did their homework and made their products as OEM+ as possible. The LSD is a real game changer, allowing you to almost pivot under load around corners. The handling experience is very similar to the Integra Type R (DC5) which is high praise. A combo of lightweight, brakes + wheels, quality tyres & a trick diff to make sure that power goes to the right wheel means the CRZ cn utilise it's power incredibly efficiently.

I'm keen to drive the car more and explore the limits when the weather is better but I can't stop smiling at how much fun I'm having.

I've got more pics to post & more future mods planned too!





CRZ by nathan proudfoot, on Flickr
 

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Discussion Starter · #51 ·
Awesome Build! Will you be doing some videos at some point?
definitely! I’ve got another one from the outside of the car revving.

to be honest, it’s way too loud. The boom in the cabin is very annoying, so I’m getting a mid silencer put in aha.

Already made a few purchases:

  • 400cc injectors
  • HKS 7040 SC unit w/90mm pulley
  • 255lp/h fuel pump

Not sure when I’m going to install these but I’m loving the drive, just needs the sound toning down for a daily drive!
 

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I've driven around 50 miles give or take so far with the car. Sadly the weather is around 10C & wet so not the best for testing the limits of the car.

First things first, power. The car did not make anywhere near the 250BHP I was hoping for. A shade under 200BHP flywheel with IMA assist. This is confusing given how HKS rate the 4015HP blower between 100-150BHP. According to the tuner we were maxing the 330cc HKS injectors & any further we would of been hitting knock issues. Now we could go to a smaller pulley but again injectors would limit us along with even hotter IATs. Currently the car runs very well so I'd rather not throw another potential issue at it.

How does this power feel? Petty damn epic, the car feels like it has a big V6 upfront with the power curve, it just keeps pulling! The sound with the double de-cat & N1 backbox is pretty extreme. Something I may need to tone down once the excitement wears off!

The handling mods are what have really changed this car, the Spoon suspension is compliant yet stiff enough to hold the car level around bends. The same can be said for the Spoon brakes, nice & progressive but stop hard when you want. You can tell Spoon did their homework and made their products as OEM+ as possible. The LSD is a real game changer, allowing you to almost pivot under load around corners. The handling experience is very similar to the Integra Type R (DC5) which is high praise. A combo of lightweight, brakes + wheels, quality tyres & a trick diff to make sure that power goes to the right wheel means the CRZ cn utilise it's power incredibly efficiently.

I'm keen to drive the car more and explore the limits when the weather is better but I can't stop smiling at how much fun I'm having.

I've got more pics to post & more future mods planned too!


by nathan proudfoot, on Flickr
Good to see another CR-Z in europe with the bigger supercharger. I was also confused because my CR-Z only reaches about 160bhp with the big GTS7040 and the 90mm pulley. Did you installed the air restrictor which is delivered with the fuel upgrade kit? I had also problems, that the first charger i got had some issues till i get a new one under warranty, but this takes me 2 or 3 years now.
 

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CLEAN I love it. Wish you were in Southern California we need more CRZ's in the boost brigade club (y)

Your dyno numbers are awesome too.
 

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Discussion Starter · #54 ·
Good to see another CR-Z in europe with the bigger supercharger. I was also confused because my CR-Z only reaches about 160bhp with the big GTS7040 and the 90mm pulley. Did you installed the air restrictor which is delivered with the fuel upgrade kit? I had also problems, that the first charger i got had some issues till i get a new one under warranty, but this takes me 2 or 3 years now.
hello mate, currently on the smaller GTS4015HP charger with no air restrictors and fuel up kit injectors (330cc installed).

My engine is forged so thought let’s take out the air restrictor as if it makes more than 200bhp, as there would be no risk of the engine throwing a rod. Shame we couldn’t get past 200bhp.

That’s interesting to know on your bigger GTS 7040 Charger. My tuner was reaching the limit of the 330cc injectors on my smaller SC, so no doubt running into the same issues in yours. Was your 160bhp at the wheels/fly and with/without IMA?

I’ve removed both the primary and secondary cats too, which is the main source of restriction.
 

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hello mate, currently on the smaller GTS4015HP charger with no air restrictors and fuel up kit injectors (330cc installed).

My engine is forged so thought let’s take out the air restrictor as if it makes more than 200bhp, as there would be no risk of the engine throwing a rod. Shame we couldn’t get past 200bhp.

That’s interesting to know on your bigger GTS 7040 Charger. My tuner was reaching the limit of the 330cc injectors on my smaller SC, so no doubt running into the same issues in yours. Was your 160bhp at the wheels/fly and with/without IMA?

I’ve removed both the primary and secondary cats too, which is the main source of restriction.
My set up was the HKS fuel up injectors and the 34mm restrictor from that kit, at that point a custom 2,5" Pipe with one 200 cell cat. My tuner didn't say something about reaching the limit of the injectors, but i was confused about the low output. The 160bhp was WITH IMA and at the Flywheel... never found out where the mistake was because i changed alot of parts since then. Maybe because i use a universal closed airbox at that point (i done that because of the strict sound regulations in germany. At the moment there is installed the normal airfilter, but i didn't hit the dyno again).
I had alot of trouble like waiting about 8 to 12 months till the kit was fully delivered after i ordered and paid the kit because of a wrong intercooler pipe.

So i follow your build and updates with alot of interest and hope i could learn a bit from you ;)
 

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Discussion Starter · #58 ·
Here was my diagram, i could also send you my flashpro map to compare if you want.
That is interesting.

My recommendations would be to do the below:

  • put the HKS air suction on, rather than the closed airbox
  • remove the air restrictors
My car has no air restrictors and is just shy off 200bhp flywheel. if I’ve learnt anything HKS seem to overrate the BHP their SC kits can do so I’d remove your restrictor, dyno and then see what you get. If it’s over 200bhp then I’d put a restrictor back in the keep the engine safe.

You could always get a custom restrictor made to control the power that way. But until you know what the max unrestricted power is, you cannot be sure.
 

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Discussion Starter · #60 ·
One of the coolest CRZ's I've seen. Nice work!
Cheers bro!

Slight change of plan on the injectors, the 400cc ones are being refunded as I'm moving up to 550cc ones.

Currently the car is very near max duty on the 330cc HKS fuel up ones so no doubt the bigger SC will require more juice.

Economy has taken a hit though. Before the SC/forging etc I was getting 36-45 MPG (UK) now I'm getting 28-32MPG (UK).

That's a big dip and whilst not unexpected, it seems a heavier hit than anticipated, especially due to the weather, I have not been driving the car hard. Saying that, the colder weather no doubt brings the economy down.

It makes me wonder about the fuel duty cycle too. The injectors are running near max which would explain why the car is being so heavy on fuel.
 
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